DESIGN: Three multiple-pass 24-hour recalls were obtained over a 14-day period to estimate mean energy intake. Total energy expenditure was measured over the same 14-day period under free-living conditions using the doubly labeled water technique.he correlation between individual measures of energy intake and total energy expenditure was not statistically significant (r = .25, P = .24). CONCLUSIONS: Data from 3 days of multiple-pass 24-hour recalls were sufficient to make valid group estimates of energy intake.
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The 2 Primary Pharmacokinetic Parameters: Vd - Volume of Distribution. the volume in the bucket of water (L) that you dump your drug dose (mg) into (see Figure below). Cl - Clearance (Elimination Clearance) the volume of bucket water per unit time that is filtered completely free of drug (see Figure below). Other Parameters that are dependent upon Vd & Cl: t1/2: half life of elimination. Css: Steady-state drug concentration (e.g. the concentration measured from a blood sample once steady-state conditions have been achieved after continuous drug dosing) 4 Important Equations: Vd = Loading Dose/Co.